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United States Patent | 5,130,543 |
Bradbeer | July 14, 1992 |
A direction sensitive energy detecting apparatus characterized by having a pair of energy receiving and transmitting devices of different polar characteristics and so disposed that they define together one end of a path in such a way as to be coincident with each other; with the sensor being adapted to give two first outputs at least one of which is variable as a function of the direction of the path and the detector having ratiometric means for generating a second output which is a function of the ratio of the two first outputs and is variable only in response to changes in direction.
Inventors: | Bradbeer; Peter F. (50 Hag Hill Rise, Taplow, Maidenhead, GB) |
Appl. No.: | 543775 |
Filed: | July 18, 1990 |
PCT Filed: | January 19, 1989 |
PCT NO: | PCT/GB89/00051 |
371 Date: | July 18, 1990 |
102(e) Date: | July 18, 1990 |
PCT PUB.NO.: | WO89/06806 |
PCT PUB. Date: | July 27, 1989 |
Jan 19, 1988[GB] | 8801143 | |
Apr 08, 1988[GB] | 8808304 |
Current U.S. Class: | 250/342; 342/432 |
Intern'l Class: | G01S 005/04; G01S 003/28 |
Field of Search: | 250/342 342/432 |
1820571 | Apr., 1931 | Krulsi | 342/432. |
3370293 | Feb., 1968 | Green | 342/432. |
3495249 | Feb., 1970 | Downie | 342/432. |
3665481 | May., 1972 | Low et al. | 342/432. |
3893120 | Jul., 1975 | Trenam | 342/432. |
4833478 | May., 1984 | Nossen | 342/432. |
Foreign Patent Documents | |||
98235 | Jan., 1984 | EP. | |
2830308 | Jan., 1980 | DE. | |
2389847 | Dec., 1978 | FR. | |
1196095 | Jun., 1970 | GB. | |
1390820 | Aug., 1972 | GB. | |
87/03696 | Jun., 1987 | WO. |